So JSR 323 has failed the review ballot, which means it's out before first base. It never quite looked viable.
What is interesting is the voting comments from the JCP Executive Committee. It seems that the later voters are referring to voting comments made by earlier voters. Which means that the later voters can see the voting comments (and presumably the votes) made by the earlier voters...
If (newly announced) JSR 323 is viable, it looks like it might give us continuations.
If you can move a thread to another JVM and have it run there, you can also presumably move it to storage, pull it back onto the original JVM some time later, and have it continue execution.
This might be worth watching.